Printable Hard Sudoku

Set 15b7mik. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
3
2 6 9 8 3
8 7 4 2
2 5 6 1
9 7 1 6
4 8
2 8 9
3 9 2
9 1 4
Hard #2
2 6
8
1 7 4 9
7 9 3 1
4 5 2 7 3 9
6 1
7 8 2 5
4 7 3 8 6
1
Hard #3
4 2
7 6 2 8 5
3 8 9 7
8 2 3 5
4 7
2 3 7 9
7 8 5 6
5 7
9 8
Hard #4
3 4 7
2 8
5 3 9 2
8 2 9
1 3 6
4 1 7 9
6 4 2 8
8 9 7 3
5 8
Hard #5
3 6 5
9 1
1 8 6
9 6 3 8
1 6 4
1 5 3
4 9 5 2 1
3 7 4
6 7 8
Hard #6
7 9 8 1 3
3 7
2 5 1 6
3 4 8
5 8 3
6 5 7 2
3 4 8
5 1
1 7 9
Hard #7
8 4
5 9 6 7
1 3 8 9
6 3 1 2
3 5
5 6 1 4 9
5 4 1
6 1
9 7 8
Hard #8
4 9 2
3 7 1
3 4
4
9 8 2 1
4 6 2 9 8
4 6 1 5 7
1
3 7 2 5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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